Device to form teeth in the edge of a knife



May 31, 1949. PAVESI ET AL 2,471,699

DEVICE TO FORM TEETH IN THE EDGE OF A KNIFE Filed Feb. 5, 1947 2Sheets-Sheet 1 I INVENTZORS. Lou/s Paves/ y Franc/s F. Roa'om @L' -wkr-May 31, 1949. PAVESI ET AL 2,471,699

DEVICE TO FORM TEETH IN THE EDGE OF A KNIFE Filed Feb. 5, 1947 2Sh'eefs-Sheet 2 5 INI ENTQRS.

Lou/s Paves/ y Franc/s F. Rodon/ Patented May 31, 1949 OFFICE DEVICE TOFORM TEETH IN THE EDGE OF A KNIFE Louis Pavesi and Francis F. Rodoni,San Francisco, Calif.

Application February 5, 1947, Serial No. 726,708

4 Claims.

This invention relates to improvements in knife sharpening devices, andhas particular reference to a device for forming teeth on the edge of aknife.

The principal object of this invention is to produce a device whereinteeth may be formed upon the opposite edges and ends of an ordinarytable knife.

A further object is to produce a device of this character which may beused by an unskilled person with equally uniform results.

Another object is to produce a device of this character which iseconomical to manufacture, one which may be easily transported and onewhich is neat and attractive in appearance.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

Fig. 1 is a perspective view of our device.

Fig. 2 is a top plan view of Fig. 1, having portions thereof brokenaway.

Fig. 3 is a front plan view of our device, having portions broken away.

Fig. 4 is a side elevation of a knife after the same has been edged inour device, and

Fig. 5 is a cross-sectional view taken on the line 5-5 of Fig. 2, andlooking in the direction of the arrow.

An ordinary table knife, or so-called silver knife, is relatively dulland, therefore, cannot be used for the purpose of separating hard-to-cutfood. It has heretofore been customary to pro vide sharp, steel knives,commonly termed steak knives, whenever such food is to be served. Thisrequires not only additional equipment, as in restaurants and the like,but also requires extra handling, washing, etc.

Applicants have. therefore, devised a machine for the sharpening of theedges of silver knives, by forming teeth along the forward cuttingportion of the knife so that the same will have a sawing effect, therebyeliminating the necessity for providing steel steak knives.

In the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of our invention, the numeral 5 desi natesa base plate, having standards 6 and l. between which are parallel,tubular spacers 8 and 9.

Mounted substantially halfway between the spacers, and parallel thereto,is a toothed cutter in the form of a file ll of special construction, 1.e., the cutting portion of the toothed cutter or file is formed withdiverging ridges extending from a medial line towards both ends of thefile.

The file is preferably positioned on an angle and held in the uprightsby screws l2.

Mounted upon the spacers 8 and 9 is a slider l3, which slider has a pin14, which extends through a slot l6 into the upper spacer, the purposeof which will be later seen.

A similar pin I! extends through a slot l8 in the lower spacer 8.

In the upper spacer we place springs 19 and 2 l, against which the pinl4 may contact.

Positioned on the base 5 is a support 22, which has secured to its upperend a V-shaped knife gauge 23, which is adapted to be contacted by theend of the knife shown at A. The knife is angularly disposed and held tothe slider l3 by a retainer 24 which hooks over the top of the knife.(See Figs. 1 and 5.)

The result of this construction is that when a knife is placed in theretainer, as shown in Fig. 1, the knife will be in edging position.

By now moving the knife as a whole toward the left of the drawing andbearing downwardly thereon, the blade will be brought into contact withthe teeth of the file, and the tip of the knife will be guided along oneside of the V-shaped knife gauge 23.

Consequently, the teeth of the file will move across the edge of theblade, thereby cutting teeth in the blade, the guide 23 assuring auniform cross movement, so that if the knife is moved across the fileseveral times it will always contact the same teeth of the file, thusincreasing the depth of the tooth being cut.

By lifting the handle of the knife slightly a rocking motion will permitthe teeth to be formed along the curvature of the knife, as shown inFig. 4.

As the knife moves toward the left the pin 14 will tend to compress thespring l9, thus giving a slight resistance to the sidewise movement ofthe knife.

When it is desired to sharpen the opposite side of the knife the same iswithdrawn and placed on the left side of the slider and the same generaloperation repeated.

It will thus be seen that we have produced a device which willaccomplish all of the objects above set forth.

It is to be understood that the form of our invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claims.

Having thus described our invention, we claim:

1. In a device for cutting teeth along the edge of a knife-blade, anelongated cutter having oppositely diverging cutting ridges extendingfrom a medial line toward the opposite ends of said cutter, knifepositioning means mounted adjacent said cutter, and a gauge mountedparallel to the cutting ridges of said cutter whereby a knife in saidpositioner and abutting said gauge may be moved over said cutting ridgesto form teeth therein.

2. In a device for cutting teeth in the edge of a knife, a cutter havingdiagonally positioned cutting ridges formed therein, a sliderresiliently and slidably positioned parallel to said cutter, knifepositioning means-carried on said slider, and a gauge having its endoverlying said cutter and positioned. parallel to the cutting ridges ofsaid cutter whereby a knife positioned in said positioner will engagethe teeth of said cutter and be guided thereover.

3. In a device for cutting teeth on the edges of a knife, a base, a pairof standards mounted on said base, tubular spacers extending between .4said standards, an elongated cutter positioned between said spacers,said cutter having cutting ridges formed thereon, said ridges divergingtoward the opposite ends of said cutter from the medial line of saidcutter, and a V-shaped gauge supported from said base and having itsends overlying said cutter, the ends being parallel to the cuttingridges of said cutter.

4. In a device for cutting teeth on the edges of a knife, a base, a pairof standards mounted on said base, tubular spacers extending betweensaid standards, an elongated cutter positioned between said spacers,said cutter having cutting ridges formed thereon, said ridges divergingtoward the opposite ends of said cutter from the medial line of saidcutter, a V-shaped gauge supported from said base and having its endsoverlying said cutter, the ends being parallel to the cutting ridges ofsaid cutter, a slider mounted on said spacers and normally held adjacentthe medial line of said cutter by opposing springs, and a knifepositioner mounted on said slider and serving to position a knifeangularly disposed with relation to the cutting surface of said cutter.

LOUIS PAVESI. FRANCIS F. RODONI.

No references cited.

